In late June and early July, a lava lake occupied the
collapsed crater of Pu'u 'O'o. The most active vent feeding the lake was
at the same position as the former East Pond Vent. On this page, several
photos show the strong fountaining from this vent feeding the lava lake on
14 July, shortly before it ceased.

As gas bubbles burst, the fountaining at the vent throws
pieces of liquid lava several meters into the air.

The hornito above the vent before (left) and immediately
after its sudden collapse (right), which explosed the violently boiling
lava underneath it to the surface.